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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0170ae0c499d3b366a2998684914868dee88aef70535576f47505586d7e0add' 
  AND token = 'F+ddT4UjexiPWdngJTRDb0u3rz8PRt/CSalMYCigN0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}